Stair-tread and the like.



E. S. HIGGINS.

STAIR TRBAD AND THE LIKE. APPLICATION FILED DBO.19, 1911.

1,05 1,583. Patented Jan.28, 1913.

WMM f4.7.

entran srarns PATENT oFFlcE EDWARD SMITH HIGGINS, OF BALHAM, LONDON, ENGLAND, ASSIGNOR TO THE SAFETY TREAD SYNDICATE LIMITED, 0F LONDON, ENGLAND.

STAIR-TREAD AND THE LIKE.

Specification of Letters Iatent.

Patented Jan. 28, 1.913.

Application filed DecemberlS, 1911. Serial No. 666,796.

To all whom t may concern.'

Be 1t known that l, Enwalm SMITH llIG- Y ams, a subject ot the King ot Great Britain,

and resident of 21 Corn'ford Grove, Balham, London, England, consulting engineer, have invented new and use't'ul Improvements in Stz'ti1',l`reatlsand the Like, ot which the following is a specification.

The present invention has reference to stair treads and the like ot the kind which 4(,-omprises a metal plate or base provided vwithgrooves into whleh lead or other nonslipping materla 1s introduced.

represents in cross section a form of tread.

for stairs embodying this invention. Fig. 2 'is a plan View thereof. Fig. 3 shows 1n seetion a partly manufactured plate trom which the tread shown in Figs. 1 and 2 is formed, and, Fig. 4 shows in section a fully formed plate without the filling material.

The plate a with ribs thereon may be iliormed {n.'etcrably by rolling. The' vrst rolling leaves the plate in the form shown in ltig. 3. Z are. `grooves or channels and c are ribs extending between the grooves; the tops ot' the ribs are stepped as shown. This form ot plate is easily rolled as a clearance for the projections on Vthe roller is easily furnished. In a second rolling the ribs c are divided as shown in Fig. et and spurs e are thrown out into the channels or grooves b on one side while the remainder oi the ribs c is set over to overhang the channels on the other side and to complete a dovetail, well adapted t'or retaining material in the said channels. b

Figs. 1 and show the channels filled alternately with lead l and other material such as carborurnlum.

T he operation ot rolling may be superseded in whole or in part by casting, but rolling the plate as above explained is the preferred method ot manufacture.

It will be observed that a flat tread is provided with a very ellicient key for the nonslipping material with a very small exposure of hard metal on the surface.

l/Vhat I claim and desire to secure by Letters Patent of the United States is A plate for holding non-slipping material for stair treads and the like, provided with ribs projecting upwardly therefrom and separated by channels, the said ribs being provided with spurs of less height than the ribs and. projecting laterally into a channel on one side of the rib and the top ot' the rib above the spur being bentl into the channel on the opposite side of the rib, whereby a body of non-slipping material may extend intact from the channel over the spur into the space between the spur and rib.

In testimony whereof I have signed my name to this specification in the presence ot two subscribing witnesses.

EDWARD SMITH HIGGINS.

Witnesses t 4 Amman S. BISHOP, Hemmer D. JAMESON. 

